The Ftape Installation Guide - zftape devices
I chose the following names(1) for the devices provided by zftape (example for drive selection method A, see Drive selection):
| device name | bits of minor device number `lsb-msb' | compr. support | file marks | rewind on close | can read v2.x | raw access ioctls |
| /dev/qft0 | 0|0|0|0|0|0|0|0 | no | yes | yes | yes | no |
| /dev/nqft0 | 0|0|1|0|0|0|0|0 | no | yes | no | yes | no |
| /dev/zqft0 | 0|0|0|0|1|0|0|0 | yes | yes | yes | yes | no |
| /dev/nzqft0 | 0|0|1|0|1|0|0|0 | yes | yes | no | yes | no |
| /dev/rawft0 | 0|0|0|0|0|1|0|0 | no | no | yes | no | yes |
| /dev/nrawft0 | 0|0|1|0|0|1|0|0 | no | no | no | no | yes |
The headers of the different columns have the following meaning:
bits of minor device number'
compr. support'
file marks'
rewind on close'
n' in front of all the device names that rewind when closing them
(see Rewinding devices, see MTREW, see MTOFFL).
can read v2.x'
raw access ioctls'
Please refer to the respective subsections for more remarks about the different devices (see /dev/qft, see /dev/rft, see /dev/zqft, see /dev/rawft).
There is a script MAKEDEV.ftape that can produce these devices for
you. See Installing ftape. You find it under
`./contrib/scripts/'. The devices which I called `/dev/qft*'
and `/dev/nqft*' were also used by the original ftape. In the latest
versions of the original ftape-2.x driver they were called `/dev/rft*'
and `/dev/nrft*', older versions of ftape called them
`/dev/ftape' and `/dev/nftape'. See Installing ftape.
(1) The `q' stands for QIC,
the `z' for `zip', a hint for the builtin compression zftape
provides, and the `n' is a shortcut for Non-rewinding
(see Rewinding and non-rewinding devices)
(2) least significant bit
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